Half to isaac l



(No Model.)

R. SAVAGE. CHIMNEY OR SMOKE STAGK. No. 500,779. Patented Jul-y 4, 1893.

UNITED STATES PATENT OFFICE.

EICHARD SAVAGE, OF SAN FRANCISCO, CALIFORNIA, ASSIGNOR OF ONE HALF TO ISAAC L. MERRELL, OF SAME PLACE.

CHIMNEY OR SMOKE-STACK.

SPECIFICATION forming part of Letters Patent No. 500,779, dated July 4, 1893.

Application filed July 22, 1892- Serial No, 40,854. (No model.)

To all whom it may concern.-

Be it known that I, RICHARD SAVAGE, a citizen of the United States, residing at San Francisco, in the county of San Francisco and State of California, haveinvented certain new and useful Improvements in Chimneys or Smoke-Stacks; and I do hereby declare that the following is a full, clear, and exact de scription thereof.

My invention relates to an improved form of chimney or smoke-stack adapted especially to be connected to a fire place in the interior of a building. In the present practice of constructing large buildings it is usual to make such chimneys of solid brick work or of terra cotta, the entire structure being necessarily of great weight.

The object of my invention is to construct a metallic chimney of comparatively light weight which will possess all the advantageous qualities of the brick or terra cotta structure for conveying the smoke and other products of combustion, and which will be equally safe in relation to the surrounding structure of the building.

The invention is illustrated in the accompanying drawings, in which- Figure 1, is a vertical section; Fig. 2, a crosssection; and Fig. 3, a perspective view showing the connection of the chimney to a shell of sheet iron or other suitable material, the latter being supposed to surround a fire place Within a building.

In the drawings A represents a shell constructed of sheet metal of any suitable kind, having an open front 1, so as to allow of the insertion of a fire place within the building. The top or roof of the shell is provided with an opening to allow the smoke to enter the sectional chimney from the fire place. The chimney itself is composed of inner cylindrical sections B, of copper and of outer cylindrical sections C, preferably of galvanized iron, the number of sections depending upon the height to which the chimney is to be carried. Inasmuch as the two metals of which the chimney is composed expand and contract unequally under the temperatures to which they may be subjected, the inner or copper cylinder which has the greater range of expansion and contraction is flanged at its upper end as shown at 2. The sections composing the outer cylinder rest one upon another as shown in Fig. 1, and the joint is socured by a sleeve D,held in placein any suit able manner, preferably between beads 3, formed upon the respective sections of the outer shell. A non-conducting packing or filling of asbestus or mineral wool, or any other suitable substance is forced between the two shells which form the cylindrical chimney. Each corresponding section of the inner and outer shells is substantially of the same length, so that the flanging of the inner section permits a space to be left between it and the adjacent section, as shown in Fig. 1, thus permitting all the sections of the inner cy1inder to expand and contract according to the temperature. In order to provide for additional security in holding the outer sections together, I prefer to provide such sections with lugs 5, which may be used for attaching a wire for binding the adjacent sections at their joint. The advantages of this construction consist partly in its extreme lightness as compared to the ordinary methods of building such chimneys, partly in its cheapness as compared with that of brick or terra cotta work, partly in the ease with which it can be set in place, and the speed with which it can be constructed, all of which advantages taken in connection with the fact that a chimney of this character is fully as safe as one constructed in the ordinary way are so clearly obvious as to require no more detailed recital.

To insure the solidity of the structure, the shell A, which is preferably made of steel, is provided with a top or cover E, of cast iron bolted thereto as represented in Fig. 3, at 6. This top is intended to be of sufficient strength to sustain the weight of the sectional chimney throughout its entire extent.

What I claim is' 1. A chimney or smoke-stack composed of an inner cylinder of copper sections set so as to leave spaces between their adjacent ends, an outer cylinder composed of abutting sec tions of sheet iron and a filling between the two cylinders, substantially as set forth.

2. A metallic chimney composed of inner and outer sectional shells made respectively of copper and iron, the sections of the inner shell being flanged at one of their ends so as to leave a space between their adjacent ends, and a filling between the two shells and between the adjacent ends of the inner section, substantially as set forth.

In testimony whereof I have affixed my signature, in presence of two witnesses, this 14th day of June, 1892. e

RICHARD SAVAGE.

Witnesses:

L. W. SEELY. ISAAC L. MERRELL. 

